The Helios BLS 300/150 is a robust ventilation unit designed for both supply and extract air functions in enclosed areas where fire and smoke containment is essential. It ensures continuous airflow to prevent dangerous heat buildup and achieves fire resistance ratings from F30 to F120 in accordance with DIN 4102 standards. With no moving components, the unit is entirely maintenance- and inspection-free, offering long-term reliability. Its materials are highly resistant to moisture, as well as oils, petrol, and weak acids, making it suitable for demanding environments. The system is easy to install and can be deployed based on a project-specific type approval (vBG), offering dependable protection in critical building zones.